Those nano lines are great "utility" pieces, but are not the best tones. The nanosynth is adequate at best, and the naopiano may have a "slight" edge, but still - notghing to write home about. You get what you pay for, and they are very inexpensive sound modules. Look for a Roland sound canvas if you want a nice piano or a Kurzweil piano module - they are both small and have great piano and organ sounds.
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"No day but TODAY!" (Jonathan Larson 2/4/60 - 1/25/96)
RHODES 73 suitcase, Korg PA3x, Yamaha psrS-950, Korg i5s, Roland JV1010, Fender basses, Taylor guitars, Parker guitars, Line SIX guitars, Gretsch drums, Zildjian cymbals, Yamaha sax, clarinet, flute